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e821075a LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
bd5f920f LP |
22 | #include <sys/mman.h> |
23 | ||
b5efdb8a | 24 | #include "alloc-util.h" |
e821075a | 25 | #include "bus-internal.h" |
07630cea LP |
26 | #include "bus-kernel.h" |
27 | #include "bus-policy.h" | |
e821075a | 28 | #include "bus-util.h" |
3ffd4af2 | 29 | #include "busname.h" |
07630cea | 30 | #include "dbus-busname.h" |
3ffd4af2 | 31 | #include "fd-util.h" |
07630cea | 32 | #include "formats-util.h" |
3c70e3bb | 33 | #include "kdbus.h" |
6bedfcbb | 34 | #include "parse-util.h" |
7b3e062c | 35 | #include "process-util.h" |
24882e06 | 36 | #include "service.h" |
07630cea LP |
37 | #include "signal-util.h" |
38 | #include "special.h" | |
8b43440b | 39 | #include "string-table.h" |
07630cea | 40 | #include "string-util.h" |
e821075a LP |
41 | |
42 | static const UnitActiveState state_translation_table[_BUSNAME_STATE_MAX] = { | |
43 | [BUSNAME_DEAD] = UNIT_INACTIVE, | |
a4152e3f | 44 | [BUSNAME_MAKING] = UNIT_ACTIVATING, |
5892a914 | 45 | [BUSNAME_REGISTERED] = UNIT_ACTIVE, |
e821075a LP |
46 | [BUSNAME_LISTENING] = UNIT_ACTIVE, |
47 | [BUSNAME_RUNNING] = UNIT_ACTIVE, | |
a4152e3f LP |
48 | [BUSNAME_SIGTERM] = UNIT_DEACTIVATING, |
49 | [BUSNAME_SIGKILL] = UNIT_DEACTIVATING, | |
e821075a LP |
50 | [BUSNAME_FAILED] = UNIT_FAILED |
51 | }; | |
52 | ||
53 | static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); | |
a4152e3f | 54 | static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); |
e821075a LP |
55 | |
56 | static void busname_init(Unit *u) { | |
57 | BusName *n = BUSNAME(u); | |
58 | ||
59 | assert(u); | |
60 | assert(u->load_state == UNIT_STUB); | |
61 | ||
62 | n->starter_fd = -1; | |
3f9da416 | 63 | n->accept_fd = true; |
4f101180 | 64 | n->activating = true; |
a4152e3f LP |
65 | |
66 | n->timeout_usec = u->manager->default_timeout_start_usec; | |
67 | } | |
68 | ||
69 | static void busname_unwatch_control_pid(BusName *n) { | |
70 | assert(n); | |
71 | ||
72 | if (n->control_pid <= 0) | |
73 | return; | |
74 | ||
75 | unit_unwatch_pid(UNIT(n), n->control_pid); | |
76 | n->control_pid = 0; | |
77 | } | |
78 | ||
79 | static void busname_free_policy(BusName *n) { | |
80 | BusNamePolicy *p; | |
81 | ||
82 | assert(n); | |
83 | ||
84 | while ((p = n->policy)) { | |
85 | LIST_REMOVE(policy, n->policy, p); | |
86 | ||
87 | free(p->name); | |
88 | free(p); | |
89 | } | |
90 | } | |
91 | ||
92 | static void busname_close_fd(BusName *n) { | |
93 | assert(n); | |
94 | ||
95 | n->starter_event_source = sd_event_source_unref(n->starter_event_source); | |
96 | n->starter_fd = safe_close(n->starter_fd); | |
e821075a LP |
97 | } |
98 | ||
99 | static void busname_done(Unit *u) { | |
100 | BusName *n = BUSNAME(u); | |
101 | ||
a4152e3f | 102 | assert(n); |
e821075a | 103 | |
a1e58e8e | 104 | n->name = mfree(n->name); |
e821075a | 105 | |
a4152e3f LP |
106 | busname_free_policy(n); |
107 | busname_unwatch_control_pid(n); | |
108 | busname_close_fd(n); | |
109 | ||
e821075a LP |
110 | unit_ref_unset(&n->service); |
111 | ||
a4152e3f LP |
112 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); |
113 | } | |
114 | ||
115 | static int busname_arm_timer(BusName *n) { | |
116 | int r; | |
117 | ||
118 | assert(n); | |
119 | ||
120 | if (n->timeout_usec <= 0) { | |
121 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); | |
122 | return 0; | |
123 | } | |
124 | ||
125 | if (n->timer_event_source) { | |
126 | r = sd_event_source_set_time(n->timer_event_source, now(CLOCK_MONOTONIC) + n->timeout_usec); | |
127 | if (r < 0) | |
128 | return r; | |
129 | ||
130 | return sd_event_source_set_enabled(n->timer_event_source, SD_EVENT_ONESHOT); | |
131 | } | |
132 | ||
920b52e4 | 133 | r = sd_event_add_time( |
a4152e3f LP |
134 | UNIT(n)->manager->event, |
135 | &n->timer_event_source, | |
136 | CLOCK_MONOTONIC, | |
137 | now(CLOCK_MONOTONIC) + n->timeout_usec, 0, | |
138 | busname_dispatch_timer, n); | |
7dfbe2e3 TG |
139 | if (r < 0) |
140 | return r; | |
141 | ||
142 | (void) sd_event_source_set_description(n->timer_event_source, "busname-timer"); | |
143 | ||
144 | return 0; | |
e821075a LP |
145 | } |
146 | ||
147 | static int busname_add_default_default_dependencies(BusName *n) { | |
148 | int r; | |
149 | ||
150 | assert(n); | |
151 | ||
152 | r = unit_add_dependency_by_name(UNIT(n), UNIT_BEFORE, SPECIAL_BUSNAMES_TARGET, NULL, true); | |
153 | if (r < 0) | |
154 | return r; | |
155 | ||
b2c23da8 | 156 | if (UNIT(n)->manager->running_as == MANAGER_SYSTEM) { |
e821075a LP |
157 | r = unit_add_two_dependencies_by_name(UNIT(n), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true); |
158 | if (r < 0) | |
159 | return r; | |
160 | } | |
161 | ||
162 | return unit_add_two_dependencies_by_name(UNIT(n), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true); | |
163 | } | |
164 | ||
165 | static int busname_add_extras(BusName *n) { | |
166 | Unit *u = UNIT(n); | |
167 | int r; | |
168 | ||
169 | assert(n); | |
170 | ||
171 | if (!n->name) { | |
7410616c LP |
172 | r = unit_name_to_prefix(u->id, &n->name); |
173 | if (r < 0) | |
174 | return r; | |
e821075a LP |
175 | } |
176 | ||
177 | if (!u->description) { | |
178 | r = unit_set_description(u, n->name); | |
179 | if (r < 0) | |
180 | return r; | |
181 | } | |
182 | ||
5892a914 DM |
183 | if (n->activating) { |
184 | if (!UNIT_DEREF(n->service)) { | |
185 | Unit *x; | |
e821075a | 186 | |
5892a914 DM |
187 | r = unit_load_related_unit(u, ".service", &x); |
188 | if (r < 0) | |
189 | return r; | |
190 | ||
191 | unit_ref_set(&n->service, x); | |
192 | } | |
193 | ||
194 | r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(n->service), true); | |
e821075a LP |
195 | if (r < 0) |
196 | return r; | |
e821075a LP |
197 | } |
198 | ||
e821075a LP |
199 | if (u->default_dependencies) { |
200 | r = busname_add_default_default_dependencies(n); | |
201 | if (r < 0) | |
202 | return r; | |
203 | } | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
e821075a LP |
208 | static int busname_verify(BusName *n) { |
209 | char *e; | |
210 | ||
211 | assert(n); | |
212 | ||
213 | if (UNIT(n)->load_state != UNIT_LOADED) | |
214 | return 0; | |
215 | ||
216 | if (!service_name_is_valid(n->name)) { | |
f2341e0a | 217 | log_unit_error(UNIT(n), "Name= setting is not a valid service name Refusing."); |
e821075a LP |
218 | return -EINVAL; |
219 | } | |
220 | ||
63c372cb | 221 | e = strjoina(n->name, ".busname"); |
e821075a | 222 | if (!unit_has_name(UNIT(n), e)) { |
f2341e0a | 223 | log_unit_error(UNIT(n), "Name= setting doesn't match unit name. Refusing."); |
e821075a LP |
224 | return -EINVAL; |
225 | } | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
230 | static int busname_load(Unit *u) { | |
231 | BusName *n = BUSNAME(u); | |
232 | int r; | |
233 | ||
234 | assert(u); | |
235 | assert(u->load_state == UNIT_STUB); | |
236 | ||
237 | r = unit_load_fragment_and_dropin(u); | |
238 | if (r < 0) | |
239 | return r; | |
240 | ||
241 | if (u->load_state == UNIT_LOADED) { | |
242 | /* This is a new unit? Then let's add in some extras */ | |
243 | r = busname_add_extras(n); | |
244 | if (r < 0) | |
245 | return r; | |
246 | } | |
247 | ||
248 | return busname_verify(n); | |
249 | } | |
250 | ||
251 | static void busname_dump(Unit *u, FILE *f, const char *prefix) { | |
252 | BusName *n = BUSNAME(u); | |
253 | ||
254 | assert(n); | |
255 | assert(f); | |
256 | ||
257 | fprintf(f, | |
258 | "%sBus Name State: %s\n" | |
259 | "%sResult: %s\n" | |
3f9da416 | 260 | "%sName: %s\n" |
5892a914 | 261 | "%sActivating: %s\n" |
3f9da416 | 262 | "%sAccept FD: %s\n", |
e821075a LP |
263 | prefix, busname_state_to_string(n->state), |
264 | prefix, busname_result_to_string(n->result), | |
3f9da416 | 265 | prefix, n->name, |
5892a914 | 266 | prefix, yes_no(n->activating), |
3f9da416 | 267 | prefix, yes_no(n->accept_fd)); |
a4152e3f LP |
268 | |
269 | if (n->control_pid > 0) | |
270 | fprintf(f, | |
271 | "%sControl PID: "PID_FMT"\n", | |
272 | prefix, n->control_pid); | |
e821075a LP |
273 | } |
274 | ||
275 | static void busname_unwatch_fd(BusName *n) { | |
276 | int r; | |
277 | ||
278 | assert(n); | |
279 | ||
a4152e3f | 280 | if (!n->starter_event_source) |
e821075a LP |
281 | return; |
282 | ||
a4152e3f LP |
283 | r = sd_event_source_set_enabled(n->starter_event_source, SD_EVENT_OFF); |
284 | if (r < 0) | |
f2341e0a | 285 | log_unit_debug_errno(UNIT(n), r, "Failed to disable event source: %m"); |
e821075a LP |
286 | } |
287 | ||
288 | static int busname_watch_fd(BusName *n) { | |
289 | int r; | |
290 | ||
291 | assert(n); | |
292 | ||
293 | if (n->starter_fd < 0) | |
294 | return 0; | |
295 | ||
cbf60d0a | 296 | if (n->starter_event_source) { |
a4152e3f | 297 | r = sd_event_source_set_enabled(n->starter_event_source, SD_EVENT_ON); |
cbf60d0a LP |
298 | if (r < 0) |
299 | goto fail; | |
300 | } else { | |
a4152e3f | 301 | r = sd_event_add_io(UNIT(n)->manager->event, &n->starter_event_source, n->starter_fd, EPOLLIN, busname_dispatch_io, n); |
cbf60d0a LP |
302 | if (r < 0) |
303 | goto fail; | |
cfa9677b | 304 | |
cbf60d0a | 305 | (void) sd_event_source_set_description(n->starter_event_source, "busname-starter"); |
e821075a LP |
306 | } |
307 | ||
308 | return 0; | |
cbf60d0a LP |
309 | |
310 | fail: | |
311 | log_unit_warning_errno(UNIT(n), r, "Failed to watch starter fd: %m"); | |
312 | busname_unwatch_fd(n); | |
313 | return r; | |
e821075a LP |
314 | } |
315 | ||
316 | static int busname_open_fd(BusName *n) { | |
8f077bf9 ZJS |
317 | _cleanup_free_ char *path = NULL; |
318 | const char *mode; | |
319 | ||
e821075a LP |
320 | assert(n); |
321 | ||
322 | if (n->starter_fd >= 0) | |
323 | return 0; | |
324 | ||
b2c23da8 | 325 | mode = UNIT(n)->manager->running_as == MANAGER_SYSTEM ? "system" : "user"; |
8f077bf9 | 326 | n->starter_fd = bus_kernel_open_bus_fd(mode, &path); |
23bbb0de | 327 | if (n->starter_fd < 0) |
f2341e0a | 328 | return log_unit_warning_errno(UNIT(n), n->starter_fd, "Failed to open %s: %m", path ?: "kdbus"); |
e821075a LP |
329 | |
330 | return 0; | |
331 | } | |
332 | ||
333 | static void busname_set_state(BusName *n, BusNameState state) { | |
334 | BusNameState old_state; | |
335 | assert(n); | |
336 | ||
337 | old_state = n->state; | |
338 | n->state = state; | |
339 | ||
a4152e3f LP |
340 | if (!IN_SET(state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) { |
341 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); | |
342 | busname_unwatch_control_pid(n); | |
343 | } | |
344 | ||
e821075a LP |
345 | if (state != BUSNAME_LISTENING) |
346 | busname_unwatch_fd(n); | |
347 | ||
a4152e3f | 348 | if (!IN_SET(state, BUSNAME_LISTENING, BUSNAME_MAKING, BUSNAME_REGISTERED, BUSNAME_RUNNING)) |
e821075a LP |
349 | busname_close_fd(n); |
350 | ||
351 | if (state != old_state) | |
f2341e0a | 352 | log_unit_debug(UNIT(n), "Changed %s -> %s", busname_state_to_string(old_state), busname_state_to_string(state)); |
e821075a LP |
353 | |
354 | unit_notify(UNIT(n), state_translation_table[old_state], state_translation_table[state], true); | |
355 | } | |
356 | ||
be847e82 | 357 | static int busname_coldplug(Unit *u) { |
e821075a LP |
358 | BusName *n = BUSNAME(u); |
359 | int r; | |
360 | ||
361 | assert(n); | |
362 | assert(n->state == BUSNAME_DEAD); | |
363 | ||
364 | if (n->deserialized_state == n->state) | |
365 | return 0; | |
366 | ||
c386f588 LP |
367 | if (n->control_pid > 0 && |
368 | pid_is_unwaited(n->control_pid) && | |
369 | IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) { | |
a4152e3f LP |
370 | |
371 | r = unit_watch_pid(UNIT(n), n->control_pid); | |
372 | if (r < 0) | |
373 | return r; | |
374 | ||
375 | r = busname_arm_timer(n); | |
376 | if (r < 0) | |
377 | return r; | |
378 | } | |
379 | ||
380 | if (IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_LISTENING, BUSNAME_REGISTERED, BUSNAME_RUNNING)) { | |
e821075a LP |
381 | r = busname_open_fd(n); |
382 | if (r < 0) | |
383 | return r; | |
384 | } | |
385 | ||
386 | if (n->deserialized_state == BUSNAME_LISTENING) { | |
387 | r = busname_watch_fd(n); | |
388 | if (r < 0) | |
389 | return r; | |
390 | } | |
391 | ||
392 | busname_set_state(n, n->deserialized_state); | |
393 | return 0; | |
394 | } | |
395 | ||
a4152e3f LP |
396 | static int busname_make_starter(BusName *n, pid_t *_pid) { |
397 | pid_t pid; | |
398 | int r; | |
399 | ||
400 | r = busname_arm_timer(n); | |
401 | if (r < 0) | |
402 | goto fail; | |
403 | ||
404 | /* We have to resolve the user/group names out-of-process, | |
405 | * hence let's fork here. It's messy, but well, what can we | |
406 | * do? */ | |
407 | ||
408 | pid = fork(); | |
409 | if (pid < 0) | |
410 | return -errno; | |
411 | ||
412 | if (pid == 0) { | |
413 | int ret; | |
414 | ||
ce30c8dc LP |
415 | (void) default_signals(SIGNALS_CRASH_HANDLER, SIGNALS_IGNORE, -1); |
416 | (void) ignore_signals(SIGPIPE, -1); | |
a4152e3f LP |
417 | log_forget_fds(); |
418 | ||
419 | r = bus_kernel_make_starter(n->starter_fd, n->name, n->activating, n->accept_fd, n->policy, n->policy_world); | |
420 | if (r < 0) { | |
421 | ret = EXIT_MAKE_STARTER; | |
422 | goto fail_child; | |
423 | } | |
424 | ||
425 | _exit(0); | |
426 | ||
427 | fail_child: | |
428 | log_open(); | |
da927ba9 | 429 | log_error_errno(r, "Failed to create starter connection at step %s: %m", exit_status_to_string(ret, EXIT_STATUS_SYSTEMD)); |
a4152e3f LP |
430 | |
431 | _exit(ret); | |
432 | } | |
433 | ||
434 | r = unit_watch_pid(UNIT(n), pid); | |
435 | if (r < 0) | |
436 | goto fail; | |
437 | ||
438 | *_pid = pid; | |
439 | return 0; | |
440 | ||
441 | fail: | |
442 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); | |
443 | return r; | |
444 | } | |
445 | ||
e821075a LP |
446 | static void busname_enter_dead(BusName *n, BusNameResult f) { |
447 | assert(n); | |
448 | ||
449 | if (f != BUSNAME_SUCCESS) | |
450 | n->result = f; | |
451 | ||
452 | busname_set_state(n, n->result != BUSNAME_SUCCESS ? BUSNAME_FAILED : BUSNAME_DEAD); | |
453 | } | |
454 | ||
a4152e3f LP |
455 | static void busname_enter_signal(BusName *n, BusNameState state, BusNameResult f) { |
456 | KillContext kill_context = {}; | |
e821075a LP |
457 | int r; |
458 | ||
459 | assert(n); | |
460 | ||
a4152e3f LP |
461 | if (f != BUSNAME_SUCCESS) |
462 | n->result = f; | |
463 | ||
464 | kill_context_init(&kill_context); | |
465 | ||
466 | r = unit_kill_context(UNIT(n), | |
467 | &kill_context, | |
db2cb23b | 468 | state != BUSNAME_SIGTERM ? KILL_KILL : KILL_TERMINATE, |
a4152e3f LP |
469 | -1, |
470 | n->control_pid, | |
471 | false); | |
e821075a | 472 | if (r < 0) { |
f2341e0a | 473 | log_unit_warning_errno(UNIT(n), r, "Failed to kill control process: %m"); |
e821075a LP |
474 | goto fail; |
475 | } | |
476 | ||
a4152e3f LP |
477 | if (r > 0) { |
478 | r = busname_arm_timer(n); | |
479 | if (r < 0) { | |
f2341e0a | 480 | log_unit_warning_errno(UNIT(n), r, "Failed to arm timer: %m"); |
a4152e3f LP |
481 | goto fail; |
482 | } | |
483 | ||
484 | busname_set_state(n, state); | |
485 | } else if (state == BUSNAME_SIGTERM) | |
486 | busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_SUCCESS); | |
487 | else | |
488 | busname_enter_dead(n, BUSNAME_SUCCESS); | |
489 | ||
490 | return; | |
491 | ||
492 | fail: | |
493 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
494 | } | |
495 | ||
496 | static void busname_enter_listening(BusName *n) { | |
497 | int r; | |
498 | ||
499 | assert(n); | |
500 | ||
5892a914 DM |
501 | if (n->activating) { |
502 | r = busname_watch_fd(n); | |
503 | if (r < 0) { | |
f2341e0a | 504 | log_unit_warning_errno(UNIT(n), r, "Failed to watch names: %m"); |
5892a914 DM |
505 | goto fail; |
506 | } | |
507 | ||
508 | busname_set_state(n, BUSNAME_LISTENING); | |
509 | } else | |
510 | busname_set_state(n, BUSNAME_REGISTERED); | |
e821075a | 511 | |
e821075a LP |
512 | return; |
513 | ||
a4152e3f LP |
514 | fail: |
515 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_FAILURE_RESOURCES); | |
516 | } | |
517 | ||
518 | static void busname_enter_making(BusName *n) { | |
519 | int r; | |
520 | ||
521 | assert(n); | |
522 | ||
523 | r = busname_open_fd(n); | |
524 | if (r < 0) | |
525 | goto fail; | |
526 | ||
527 | if (n->policy) { | |
8d0e0ddd | 528 | /* If there is a policy, we need to resolve user/group |
a4152e3f LP |
529 | * names, which we can't do from PID1, hence let's |
530 | * fork. */ | |
531 | busname_unwatch_control_pid(n); | |
532 | ||
533 | r = busname_make_starter(n, &n->control_pid); | |
534 | if (r < 0) { | |
f2341e0a | 535 | log_unit_warning_errno(UNIT(n), r, "Failed to fork 'making' task: %m"); |
a4152e3f LP |
536 | goto fail; |
537 | } | |
538 | ||
539 | busname_set_state(n, BUSNAME_MAKING); | |
540 | } else { | |
8d0e0ddd | 541 | /* If there is no policy, we can do everything |
a4152e3f LP |
542 | * directly from PID 1, hence do so. */ |
543 | ||
544 | r = bus_kernel_make_starter(n->starter_fd, n->name, n->activating, n->accept_fd, NULL, n->policy_world); | |
545 | if (r < 0) { | |
f2341e0a | 546 | log_unit_warning_errno(UNIT(n), r, "Failed to make starter: %m"); |
a4152e3f LP |
547 | goto fail; |
548 | } | |
549 | ||
550 | busname_enter_listening(n); | |
551 | } | |
552 | ||
553 | return; | |
554 | ||
e821075a LP |
555 | fail: |
556 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
557 | } | |
558 | ||
559 | static void busname_enter_running(BusName *n) { | |
560 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
561 | bool pending = false; | |
562 | Unit *other; | |
563 | Iterator i; | |
564 | int r; | |
565 | ||
566 | assert(n); | |
567 | ||
5892a914 DM |
568 | if (!n->activating) |
569 | return; | |
570 | ||
05a08cb6 | 571 | /* We don't take connections anymore if we are supposed to |
e821075a LP |
572 | * shut down anyway */ |
573 | ||
574 | if (unit_stop_pending(UNIT(n))) { | |
f2341e0a | 575 | log_unit_debug(UNIT(n), "Suppressing activation request since unit stop is scheduled."); |
16ac4014 LP |
576 | |
577 | /* Flush all queued activation reqeuest by closing and reopening the connection */ | |
ff975efb | 578 | bus_kernel_drop_one(n->starter_fd); |
16ac4014 | 579 | |
16ac4014 | 580 | busname_enter_listening(n); |
e821075a LP |
581 | return; |
582 | } | |
583 | ||
584 | /* If there's already a start pending don't bother to do | |
585 | * anything */ | |
586 | SET_FOREACH(other, UNIT(n)->dependencies[UNIT_TRIGGERS], i) | |
587 | if (unit_active_or_pending(other)) { | |
588 | pending = true; | |
589 | break; | |
590 | } | |
591 | ||
592 | if (!pending) { | |
995c5e96 LP |
593 | if (!UNIT_ISSET(n->service)) { |
594 | log_unit_error(UNIT(n), "Service to activate vanished, refusing activation."); | |
595 | r = -ENOENT; | |
596 | goto fail; | |
597 | } | |
598 | ||
e821075a LP |
599 | r = manager_add_job(UNIT(n)->manager, JOB_START, UNIT_DEREF(n->service), JOB_REPLACE, true, &error, NULL); |
600 | if (r < 0) | |
601 | goto fail; | |
602 | } | |
603 | ||
604 | busname_set_state(n, BUSNAME_RUNNING); | |
605 | return; | |
606 | ||
607 | fail: | |
f2341e0a | 608 | log_unit_warning(UNIT(n), "Failed to queue service startup job: %s", bus_error_message(&error, r)); |
e821075a LP |
609 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); |
610 | } | |
611 | ||
612 | static int busname_start(Unit *u) { | |
613 | BusName *n = BUSNAME(u); | |
614 | ||
615 | assert(n); | |
616 | ||
a4152e3f LP |
617 | /* We cannot fulfill this request right now, try again later |
618 | * please! */ | |
619 | if (IN_SET(n->state, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) | |
620 | return -EAGAIN; | |
621 | ||
622 | /* Already on it! */ | |
623 | if (n->state == BUSNAME_MAKING) | |
624 | return 0; | |
625 | ||
5892a914 | 626 | if (n->activating && UNIT_ISSET(n->service)) { |
e821075a LP |
627 | Service *service; |
628 | ||
629 | service = SERVICE(UNIT_DEREF(n->service)); | |
630 | ||
631 | if (UNIT(service)->load_state != UNIT_LOADED) { | |
f2341e0a | 632 | log_unit_error(u, "Bus service %s not loaded, refusing.", UNIT(service)->id); |
e821075a LP |
633 | return -ENOENT; |
634 | } | |
635 | } | |
636 | ||
637 | assert(IN_SET(n->state, BUSNAME_DEAD, BUSNAME_FAILED)); | |
638 | ||
639 | n->result = BUSNAME_SUCCESS; | |
a4152e3f | 640 | busname_enter_making(n); |
e821075a | 641 | |
82a2b6bb | 642 | return 1; |
e821075a LP |
643 | } |
644 | ||
645 | static int busname_stop(Unit *u) { | |
646 | BusName *n = BUSNAME(u); | |
647 | ||
648 | assert(n); | |
a4152e3f LP |
649 | |
650 | /* Already on it */ | |
651 | if (IN_SET(n->state, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) | |
652 | return 0; | |
653 | ||
654 | /* If there's already something running, we go directly into | |
655 | * kill mode. */ | |
656 | ||
657 | if (n->state == BUSNAME_MAKING) { | |
658 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_SUCCESS); | |
659 | return -EAGAIN; | |
660 | } | |
661 | ||
5892a914 | 662 | assert(IN_SET(n->state, BUSNAME_REGISTERED, BUSNAME_LISTENING, BUSNAME_RUNNING)); |
e821075a LP |
663 | |
664 | busname_enter_dead(n, BUSNAME_SUCCESS); | |
82a2b6bb | 665 | return 1; |
e821075a LP |
666 | } |
667 | ||
668 | static int busname_serialize(Unit *u, FILE *f, FDSet *fds) { | |
669 | BusName *n = BUSNAME(u); | |
a34ceba6 | 670 | int r; |
e821075a LP |
671 | |
672 | assert(n); | |
673 | assert(f); | |
674 | assert(fds); | |
675 | ||
676 | unit_serialize_item(u, f, "state", busname_state_to_string(n->state)); | |
677 | unit_serialize_item(u, f, "result", busname_result_to_string(n->result)); | |
678 | ||
a4152e3f LP |
679 | if (n->control_pid > 0) |
680 | unit_serialize_item_format(u, f, "control-pid", PID_FMT, n->control_pid); | |
681 | ||
a34ceba6 LP |
682 | r = unit_serialize_item_fd(u, f, fds, "starter-fd", n->starter_fd); |
683 | if (r < 0) | |
684 | return r; | |
e821075a LP |
685 | |
686 | return 0; | |
687 | } | |
688 | ||
689 | static int busname_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
690 | BusName *n = BUSNAME(u); | |
691 | ||
692 | assert(n); | |
693 | assert(key); | |
694 | assert(value); | |
695 | ||
696 | if (streq(key, "state")) { | |
697 | BusNameState state; | |
698 | ||
699 | state = busname_state_from_string(value); | |
700 | if (state < 0) | |
f2341e0a | 701 | log_unit_debug(u, "Failed to parse state value: %s", value); |
e821075a LP |
702 | else |
703 | n->deserialized_state = state; | |
704 | ||
705 | } else if (streq(key, "result")) { | |
706 | BusNameResult f; | |
707 | ||
708 | f = busname_result_from_string(value); | |
709 | if (f < 0) | |
f2341e0a | 710 | log_unit_debug(u, "Failed to parse result value: %s", value); |
e821075a LP |
711 | else if (f != BUSNAME_SUCCESS) |
712 | n->result = f; | |
713 | ||
a4152e3f LP |
714 | } else if (streq(key, "control-pid")) { |
715 | pid_t pid; | |
716 | ||
717 | if (parse_pid(value, &pid) < 0) | |
f2341e0a | 718 | log_unit_debug(u, "Failed to parse control-pid value: %s", value); |
a4152e3f LP |
719 | else |
720 | n->control_pid = pid; | |
e821075a LP |
721 | } else if (streq(key, "starter-fd")) { |
722 | int fd; | |
723 | ||
724 | if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) | |
f2341e0a | 725 | log_unit_debug(u, "Failed to parse starter fd value: %s", value); |
e821075a | 726 | else { |
03e334a1 | 727 | safe_close(n->starter_fd); |
e821075a LP |
728 | n->starter_fd = fdset_remove(fds, fd); |
729 | } | |
730 | } else | |
f2341e0a | 731 | log_unit_debug(u, "Unknown serialization key: %s", key); |
e821075a LP |
732 | |
733 | return 0; | |
734 | } | |
735 | ||
736 | _pure_ static UnitActiveState busname_active_state(Unit *u) { | |
737 | assert(u); | |
738 | ||
739 | return state_translation_table[BUSNAME(u)->state]; | |
740 | } | |
741 | ||
742 | _pure_ static const char *busname_sub_state_to_string(Unit *u) { | |
743 | assert(u); | |
744 | ||
745 | return busname_state_to_string(BUSNAME(u)->state); | |
746 | } | |
747 | ||
bd5f920f LP |
748 | static int busname_peek_message(BusName *n) { |
749 | struct kdbus_cmd_recv cmd_recv = { | |
94e15fdc | 750 | .size = sizeof(cmd_recv), |
bd5f920f LP |
751 | .flags = KDBUS_RECV_PEEK, |
752 | }; | |
e24e415e DM |
753 | struct kdbus_cmd_free cmd_free = { |
754 | .size = sizeof(cmd_free), | |
755 | }; | |
bd5f920f LP |
756 | const char *comm = NULL; |
757 | struct kdbus_item *d; | |
758 | struct kdbus_msg *k; | |
759 | size_t start, ps, sz, delta; | |
760 | void *p = NULL; | |
761 | pid_t pid = 0; | |
762 | int r; | |
763 | ||
dcc2fc01 LP |
764 | /* Generate a friendly debug log message about which process |
765 | * caused triggering of this bus name. This simply peeks the | |
766 | * metadata of the first queued message and logs it. */ | |
767 | ||
bd5f920f LP |
768 | assert(n); |
769 | ||
dcc2fc01 LP |
770 | /* Let's shortcut things a bit, if debug logging is turned off |
771 | * anyway. */ | |
772 | ||
773 | if (log_get_max_level() < LOG_DEBUG) | |
774 | return 0; | |
bd5f920f | 775 | |
94e15fdc | 776 | r = ioctl(n->starter_fd, KDBUS_CMD_RECV, &cmd_recv); |
bd5f920f LP |
777 | if (r < 0) { |
778 | if (errno == EINTR || errno == EAGAIN) | |
779 | return 0; | |
780 | ||
f2341e0a | 781 | return log_unit_error_errno(UNIT(n), errno, "Failed to query activation message: %m"); |
bd5f920f LP |
782 | } |
783 | ||
784 | /* We map as late as possible, and unmap imemdiately after | |
785 | * use. On 32bit address space is scarce and we want to be | |
786 | * able to handle a lot of activator connections at the same | |
787 | * time, and hence shouldn't keep the mmap()s around for | |
788 | * longer than necessary. */ | |
789 | ||
790 | ps = page_size(); | |
a9c8343e DM |
791 | start = (cmd_recv.msg.offset / ps) * ps; |
792 | delta = cmd_recv.msg.offset - start; | |
793 | sz = PAGE_ALIGN(delta + cmd_recv.msg.msg_size); | |
bd5f920f LP |
794 | |
795 | p = mmap(NULL, sz, PROT_READ, MAP_SHARED, n->starter_fd, start); | |
796 | if (p == MAP_FAILED) { | |
f2341e0a | 797 | r = log_unit_error_errno(UNIT(n), errno, "Failed to map activation message: %m"); |
bd5f920f LP |
798 | goto finish; |
799 | } | |
800 | ||
801 | k = (struct kdbus_msg *) ((uint8_t *) p + delta); | |
802 | KDBUS_ITEM_FOREACH(d, k, items) { | |
803 | switch (d->type) { | |
804 | ||
805 | case KDBUS_ITEM_PIDS: | |
806 | pid = d->pids.pid; | |
807 | break; | |
808 | ||
809 | case KDBUS_ITEM_PID_COMM: | |
810 | comm = d->str; | |
811 | break; | |
812 | } | |
813 | } | |
814 | ||
815 | if (pid > 0) | |
f2341e0a | 816 | log_unit_debug(UNIT(n), "Activation triggered by process " PID_FMT " (%s)", pid, strna(comm)); |
bd5f920f LP |
817 | |
818 | r = 0; | |
819 | ||
820 | finish: | |
821 | if (p) | |
822 | (void) munmap(p, sz); | |
823 | ||
a9c8343e | 824 | cmd_free.offset = cmd_recv.msg.offset; |
dcc2fc01 | 825 | if (ioctl(n->starter_fd, KDBUS_CMD_FREE, &cmd_free) < 0) |
f2341e0a | 826 | log_unit_warning(UNIT(n), "Failed to free peeked message, ignoring: %m"); |
bd5f920f LP |
827 | |
828 | return r; | |
829 | } | |
830 | ||
e821075a LP |
831 | static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
832 | BusName *n = userdata; | |
833 | ||
834 | assert(n); | |
835 | assert(fd >= 0); | |
836 | ||
837 | if (n->state != BUSNAME_LISTENING) | |
838 | return 0; | |
839 | ||
f2341e0a | 840 | log_unit_debug(UNIT(n), "Activation request"); |
e821075a LP |
841 | |
842 | if (revents != EPOLLIN) { | |
f2341e0a | 843 | log_unit_error(UNIT(n), "Got unexpected poll event (0x%x) on starter fd.", revents); |
e821075a LP |
844 | goto fail; |
845 | } | |
846 | ||
bd5f920f | 847 | busname_peek_message(n); |
e821075a LP |
848 | busname_enter_running(n); |
849 | return 0; | |
850 | fail: | |
851 | ||
852 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
853 | return 0; | |
854 | } | |
855 | ||
a4152e3f LP |
856 | static void busname_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
857 | BusName *n = BUSNAME(u); | |
858 | BusNameResult f; | |
859 | ||
860 | assert(n); | |
861 | assert(pid >= 0); | |
862 | ||
863 | if (pid != n->control_pid) | |
864 | return; | |
865 | ||
866 | n->control_pid = 0; | |
867 | ||
868 | if (is_clean_exit(code, status, NULL)) | |
869 | f = BUSNAME_SUCCESS; | |
870 | else if (code == CLD_EXITED) | |
871 | f = BUSNAME_FAILURE_EXIT_CODE; | |
872 | else if (code == CLD_KILLED) | |
873 | f = BUSNAME_FAILURE_SIGNAL; | |
deffddf1 | 874 | else if (code == CLD_DUMPED) |
a4152e3f LP |
875 | f = BUSNAME_FAILURE_CORE_DUMP; |
876 | else | |
877 | assert_not_reached("Unknown sigchld code"); | |
878 | ||
f2341e0a LP |
879 | log_unit_full(u, f == BUSNAME_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0, |
880 | "Control process exited, code=%s status=%i", sigchld_code_to_string(code), status); | |
a4152e3f LP |
881 | |
882 | if (f != BUSNAME_SUCCESS) | |
883 | n->result = f; | |
884 | ||
885 | switch (n->state) { | |
886 | ||
887 | case BUSNAME_MAKING: | |
888 | if (f == BUSNAME_SUCCESS) | |
889 | busname_enter_listening(n); | |
890 | else | |
891 | busname_enter_signal(n, BUSNAME_SIGTERM, f); | |
892 | break; | |
893 | ||
894 | case BUSNAME_SIGTERM: | |
895 | case BUSNAME_SIGKILL: | |
896 | busname_enter_dead(n, f); | |
897 | break; | |
898 | ||
899 | default: | |
900 | assert_not_reached("Uh, control process died at wrong time."); | |
901 | } | |
902 | ||
903 | /* Notify clients about changed exit status */ | |
904 | unit_add_to_dbus_queue(u); | |
905 | } | |
906 | ||
907 | static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { | |
908 | BusName *n = BUSNAME(userdata); | |
909 | ||
910 | assert(n); | |
911 | assert(n->timer_event_source == source); | |
912 | ||
913 | switch (n->state) { | |
914 | ||
915 | case BUSNAME_MAKING: | |
f2341e0a | 916 | log_unit_warning(UNIT(n), "Making timed out. Terminating."); |
a4152e3f LP |
917 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_FAILURE_TIMEOUT); |
918 | break; | |
919 | ||
920 | case BUSNAME_SIGTERM: | |
f2341e0a | 921 | log_unit_warning(UNIT(n), "Stopping timed out. Killing."); |
a4152e3f LP |
922 | busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_FAILURE_TIMEOUT); |
923 | break; | |
924 | ||
925 | case BUSNAME_SIGKILL: | |
f2341e0a | 926 | log_unit_warning(UNIT(n), "Processes still around after SIGKILL. Ignoring."); |
a4152e3f LP |
927 | busname_enter_dead(n, BUSNAME_FAILURE_TIMEOUT); |
928 | break; | |
929 | ||
930 | default: | |
931 | assert_not_reached("Timeout at wrong time."); | |
932 | } | |
933 | ||
934 | return 0; | |
935 | } | |
936 | ||
e821075a LP |
937 | static void busname_reset_failed(Unit *u) { |
938 | BusName *n = BUSNAME(u); | |
939 | ||
940 | assert(n); | |
941 | ||
942 | if (n->state == BUSNAME_FAILED) | |
943 | busname_set_state(n, BUSNAME_DEAD); | |
944 | ||
945 | n->result = BUSNAME_SUCCESS; | |
946 | } | |
947 | ||
948 | static void busname_trigger_notify(Unit *u, Unit *other) { | |
949 | BusName *n = BUSNAME(u); | |
950 | Service *s; | |
951 | ||
952 | assert(n); | |
953 | assert(other); | |
954 | ||
955 | if (!IN_SET(n->state, BUSNAME_RUNNING, BUSNAME_LISTENING)) | |
956 | return; | |
957 | ||
958 | if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE) | |
959 | return; | |
960 | ||
961 | s = SERVICE(other); | |
962 | ||
2f671520 LP |
963 | if (s->state == SERVICE_FAILED && s->result == SERVICE_FAILURE_START_LIMIT) |
964 | busname_enter_dead(n, BUSNAME_FAILURE_SERVICE_FAILED_PERMANENT); | |
965 | else if (IN_SET(s->state, | |
966 | SERVICE_DEAD, SERVICE_FAILED, | |
967 | SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, | |
968 | SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL, | |
969 | SERVICE_AUTO_RESTART)) | |
e821075a LP |
970 | busname_enter_listening(n); |
971 | } | |
972 | ||
a4152e3f LP |
973 | static int busname_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
974 | return unit_kill_common(u, who, signo, -1, BUSNAME(u)->control_pid, error); | |
975 | } | |
976 | ||
977 | static int busname_get_timeout(Unit *u, uint64_t *timeout) { | |
978 | BusName *n = BUSNAME(u); | |
979 | int r; | |
980 | ||
981 | if (!n->timer_event_source) | |
982 | return 0; | |
983 | ||
984 | r = sd_event_source_get_time(n->timer_event_source, timeout); | |
985 | if (r < 0) | |
986 | return r; | |
987 | ||
988 | return 1; | |
989 | } | |
990 | ||
1c2e9646 | 991 | static bool busname_supported(void) { |
d69a7cea | 992 | static int supported = -1; |
0faacd47 LP |
993 | |
994 | if (supported < 0) | |
d79acc30 | 995 | supported = is_kdbus_available(); |
0faacd47 LP |
996 | |
997 | return supported; | |
998 | } | |
999 | ||
e821075a LP |
1000 | static const char* const busname_result_table[_BUSNAME_RESULT_MAX] = { |
1001 | [BUSNAME_SUCCESS] = "success", | |
1002 | [BUSNAME_FAILURE_RESOURCES] = "resources", | |
a4152e3f LP |
1003 | [BUSNAME_FAILURE_TIMEOUT] = "timeout", |
1004 | [BUSNAME_FAILURE_EXIT_CODE] = "exit-code", | |
1005 | [BUSNAME_FAILURE_SIGNAL] = "signal", | |
1006 | [BUSNAME_FAILURE_CORE_DUMP] = "core-dump", | |
700ff4d9 | 1007 | [BUSNAME_FAILURE_SERVICE_FAILED_PERMANENT] = "service-failed-permanent", |
e821075a LP |
1008 | }; |
1009 | ||
1010 | DEFINE_STRING_TABLE_LOOKUP(busname_result, BusNameResult); | |
1011 | ||
1012 | const UnitVTable busname_vtable = { | |
1013 | .object_size = sizeof(BusName), | |
1014 | ||
1015 | .sections = | |
1016 | "Unit\0" | |
1017 | "BusName\0" | |
1018 | "Install\0", | |
1019 | .private_section = "BusName", | |
1020 | ||
e05ad7bc LP |
1021 | .no_alias = true, |
1022 | .no_instances = true, | |
1023 | ||
e821075a LP |
1024 | .init = busname_init, |
1025 | .done = busname_done, | |
1026 | .load = busname_load, | |
1027 | ||
1028 | .coldplug = busname_coldplug, | |
1029 | ||
1030 | .dump = busname_dump, | |
1031 | ||
1032 | .start = busname_start, | |
1033 | .stop = busname_stop, | |
1034 | ||
a4152e3f LP |
1035 | .kill = busname_kill, |
1036 | ||
1037 | .get_timeout = busname_get_timeout, | |
1038 | ||
e821075a LP |
1039 | .serialize = busname_serialize, |
1040 | .deserialize_item = busname_deserialize_item, | |
1041 | ||
1042 | .active_state = busname_active_state, | |
1043 | .sub_state_to_string = busname_sub_state_to_string, | |
1044 | ||
a4152e3f LP |
1045 | .sigchld_event = busname_sigchld_event, |
1046 | ||
e821075a LP |
1047 | .trigger_notify = busname_trigger_notify, |
1048 | ||
1049 | .reset_failed = busname_reset_failed, | |
1050 | ||
0faacd47 LP |
1051 | .supported = busname_supported, |
1052 | ||
e821075a | 1053 | .bus_vtable = bus_busname_vtable, |
e821075a LP |
1054 | |
1055 | .status_message_formats = { | |
1056 | .finished_start_job = { | |
1057 | [JOB_DONE] = "Listening on %s.", | |
1058 | [JOB_FAILED] = "Failed to listen on %s.", | |
e821075a LP |
1059 | }, |
1060 | .finished_stop_job = { | |
1061 | [JOB_DONE] = "Closed %s.", | |
1062 | [JOB_FAILED] = "Failed stopping %s.", | |
e821075a LP |
1063 | }, |
1064 | }, | |
1065 | }; |